GASTROPODA 



527 



;pecies pieseiit locally in many places in the 



Color gray, with alternate longitudinal 



Fig. 818 — Limax maximufi (Baker). 1, mantle; 2, 

 respiratoi'y pore : '.^, anterior tentacles ; 4, posterior ten- 

 tacles ; 5, eye ; 6, genital pore. 



mm. or more: an European 

 eastern states. 



L. maximus L. (Fig. 818) 

 rows of spots and 

 stripes of black, re- 

 placed by irregular 

 blotches on the man- 

 tle; dirty white be- 

 low ; body covered 

 with coarse, elon- 

 gated tubercles; 



length 16 cm. : an European species present locally in many places in the 

 eastern states; California. 



2. Agriolimax Morch. Body keeled behind and unspotted; jaw 

 with blunt ends : animals live under stones and decaying wood and feed 

 on leaves, etc.; they can suspend themselves by 

 threads of mucous from bushes and trees. 



A. campestris (Binney) (Fig. 819). Color uni- 

 formly graj'ish or amber, often blackish; upper 

 surface covered with prominent tubercles, not flat- 

 tened ; mantle oval ; mucous watery ; length 25 mm. : 

 common in eastern and central America, under logs, 

 damp leaves, etc. ; California. 



Upper surface covered with flat, gray, or brown 

 by darker-colored anastomosing gTooves; mantle 

 pore bordered with white; mucous milky; length 25 to 50 mm.: eastern 

 America; California; an European species locally present in many 



places. 



Family 13. AKIONIDAE.* 



Slugs. No external shell, but the small shield-like mantle usually 

 encloses a calcareous rudiment of one; body elongate, limaciform; jaw 

 with prominent ribs; foot with marginal furrows; ureter reflexed: 4 

 genera; about 15 American species, mostly on the Pacific slope. 



1. Arion Ferussac. Body ending obtusely behind; back covered 

 with elongated tuberosities arranged in row^s, and not keeled; mantle 

 oval and covered with granulations containing calcareous particles, 

 which represent the shell; mantle pore anterior: 25 species, all in the 

 Old World. 



A. hortensis Fer. Color gray or yellowish or black ; length 5 cm. : an 

 European species, which occurs locally in New England and other places. 



* See "Revision of North American Slugs." by H. A. Pilsbry and E. G. Vanatta, 

 Proc. Acad. Nat. Sci., Phila., 1896, p. 339 ; also 1898, p. 219. 



Fig. 819 — Agrioli- 

 max tampestris (Bin- 

 ney). 1, mantle; 2, 

 posterior tentacles. 



A. agrestis (L.), 

 tubercles, separated 



